On one side of the road, engineers applied a one-inch layer of ground tyre rubber as an asphalt overlay, while on the other side, a polymer-modified asphalt portion served as the control. The design of both blends met the Ohio Department of Transportation's requirements. The tyre rubber part and the control had the same pavement condition rating in every year reported in the study, which was a noteworthy outcome of ten years of monitoring. After four years, the rating reached 87%, and during the ten-year observation period, it barely altered. Rubber-modified asphalt is not always superior, according to the test. It has been shown that recycled tyre rubber can create a pavement section with long-term performance comparable to the conventional control under the conditions on King Road.
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